Bending machine



Dec. 8, 1925.

M. F. BAYER BENDING MACHINE- Filed M28. 1921 5 Sheets-Sheet 1 Dec. 8, 1925; 1.565.001

M, F. BAYER SENDING MACHINE Filed Feb. 28 1921 ts-S heet 2 Dec- 8, 1925- 4 M. F. BAYER- BENDING MACHINE Filed Feb. 28. 1921 5 Sheets-Sheet 4 M. F. BAYER 3523mm, MACHINE Filgd Feb. 28, 1921 5 Sheets-Sheet 5 Patented Dec. 8, 1925 Tan :sira T255 r TEN fr onnes.

MATTHEW T. BAYER, OF K-ENOSH-A, WISCONSIN, 'ASSIGNOR TO SIMMONS COMPANY, 0F KENOSHA, WISCONSIN, A CORPORATIONOF DELAWARE.

BENDING MIACHINE.

Applic ation filed February 28, 1921. ,Serial 1%. 448,475.

T0 all 'whmnit may. concern.

Beit known that 'I, MA'r'rHEW .F. BAYER, a citizen of the United States, residing at Kenosha, in .the county of lKenOSha and State of 'YVisconsin, have invented certain new and useful Improvements in "Bending ,Machines, of Whieh the following is ,a' specification.

This invention relates .to bending machines but more particularly .tosuCh asare intended for the bending of metallic tubes.

The primary object of the invention is to provide asimpleand-e'l'ficient ,machine for accurately bending tubes to a predetermined curvature.

Another important Object is .to provide a machine whichis capable of bending tubes into irregular or varying curvatures.

Further objects of'the invention are .to prevent scoring of the tube \during the bending operation, to maintain uniformity of cross; section of. thetube duringrthe'bend- .ingoperation, toprovide a simple and efficient means for inserting a laminated ,oore Withinthe tube prior tothe bending, to provide adjustablemeans ,fOIidGlJBIIIllIlingthe extentof the-insertion of the core Within'the-itube,,t0 prevent buckling of the strips composing the coreduring their insertion into the-tube, to insure afirm pressureofthe .bending member upon \the tube during theibending operation, and:to provide simple ,and': efficient actuating and-controlling means for :the bending member.

The many other objectsand advantages of-the invention will be better understood from the followingspecificationhen considered in connection with the accompanying drawings illustrating aselected embodimentthereof, in which Fig. 1 is a plan vieWof my invention; .Fig. 2-is a sideelevation; Fig. ,3 is a section on .the line of Fig. 2;

Fig. 4 is an .enlarged plan vieW of the binding head and-adjacent parts;

Fig. 5 is a section on the linev -5-5 .of Fig. 4;

Fig. .6 is a section on-the line '66 of Fig. 4;;

Fig. 7 is apartial section on the linef7+7 of Fig. 4:; V i

Fig. Sis'a section on the line 8-8 of Fig. '4;

Fig. 9 is a detail view illustrating the position of the core, tube, forming die. and

blade at the start o'fthe core inserting operation ,Fig. 10 is the sameas Fig. 9 but withvthe parts in the position of partial insertionof the core;

Fig. -11 is a detail vieiv showing the end of the tube pressedagainst the positioning shoulders ready to receive thecore;

Fig. 12 shows the tube atthe completion of the bending operation, and r Fig. 13 is a-detail View ofthe cross head and adjacent parts atthe completion of the core inserting operation.

Referring to ithe'drawings, the machinecomprisingthe, present invention is shown mountednpon azbase or table,20-supp0rted by legs 21. the various parts is containedin a supply ,tanlr 22'l0eatedin any suitable positiomand .arily mounted upon-the table 20. Pistons 27 and 28' operate in the ;cylinders .24cand 26, respectively. Fluid under pressure .is admitted to the cylinder24 in the rearfof V thepiston 27 by the pipe 29. A pressure Fluid: under; pressure, to. actuate V pipe30 admits'fiuidto the'lfront end of the cylinder24.- Flexible 'j0ints29. and 31are provided in the pipes 29 and. 30, respectively,

to permit theiouter portion of thesegpipes to swing with "the cylinder 24. Theffluid pressure in the pipes .29 and 30 is controlled by the valve 82. Similarly, fluid under- ,pressure is admitted to the; cylinder 26 in rear of-the piston 28 by the pipe83 and to the ,front of this cylinder l'byQthe pipe 34. The fluid pressure in thepipes and 34is controlled by the valve 3i5.

the curvature of the bent tube.

The piston rod 36 connected to the piston 27 in the cylinder 24 carries on its inner extremity the bending head 37 The inner end 38 of the piston rod is forked and a pin 39 passes through the forked end. Toggle links 40 and 41 are connected to the pin 39. A boss 42 is formed on the link 41 and fits about the sliding sleeve 43. This boss 42 rests upon a corresponding boss 44 formed in the sliding block 45 dovetailed in the sad dle 46 of the head 37. The outer extremity of the toggle link 40 is forked and the pin 47 passes through the extremities thereof to unite this link to the link 48. The link 48 connects the upper extremities of the upright pins 49 and 50 which are mounted in the saddle 46. Rollers 51 and 52 are provided. on the lower extremity of these pins 49 and 50, respectively, and are held in place thereon by the heads 53 and 54. These pins 49 and 50 are locked within the saddle by the set-screws 55 and 56, respectively. A pin 57 fits within the sleeve 43 and is provided at its lower extremity with a roller 58 retained thereon by the head 59. The upper extremity of the pin 57 is connected to the operating handle 60 by the pin 61 fitting within the elongated slots 62 of the pin 57. The handle 60 is pivotally mounted on the pin 63 in the slotted head 64 of the pin 39. A set-screw 65 may be provided in the forked end of the piston rod 36 to lock the pin 39 in position therein. An arm 67 is secured upon the boss 44 and extends upwardly beside the handle 60. The upper extremity of this arm 67 is perforated to receive a pin 68 to permit the handle 60 to be maintained in its raised position in the manner indicated in dot to support the bending roller 58 in its inoperative position. An adjustable stop 37 is provided on the bending head 37 to limit the action of the toggle joint and. thus prevent the locking of this head on the forming die 69.

The forming die 69 is secured upon the top face of the table 20 by screws 70 or other suitable means. This forming die preferably consists of a center block 71 secured between top and bottom plates 72 and 73 respectively. These top and bottom plates 72 and 73 project laterally beyond the side edge of the center block 71 to form with the face of the center block a forming groove 74 in the side face of the die to receive and tightly fit the tube 75 which is to be bent. The form of this die will naturally depend upon the shape of the tube to'be bent and The top face of the upper plate 72 of the die forms with the side face of the center block a guide for the bending head 37 during the bending operation. The rollers 51 and 52 on the pins 49 and 50, respectively, engage the outer guide face 80 of the center block 71 and are positioned thereon by the slightly projecting edges of the upper and lower sition by the spring 89 when the pressure in the cylinder 86 is released. A lock 90 controlled by the handle 91. is provided to secure the head in its advancedposition- A laminated core 92 composed of sufficient strips of thin steel or other suitable material to completely fill the interior of the tube, is inserted therein before the bending operation is commenced. The rear end of the core 92 is secured to the upper end of the cross head 93. The forward end of the core fits within the perforation 95 in the block 96 which. forms a stop to position the rear end of the tube 75. The lower extremity of the cross-head 93 is connected to the outer end of the piston rod 97. A crosshead guide 98 is mounted upon the table 20. A clamp 99 is preferably placed about the core about midway between its ends to prevent the buckling of the strips as the core is forced into the tube by the crosshead 93. The clamp 99 is attached to the table 20 by a chain 100. When a tube of short length is to be bent, a plate 101 of the proper length may be laid upon the guide 98, as indicated in dot in Fig. 2 of the drawings. This plate 101 willinterrupt the movement of the clamp 99 with the core and cause this clamp to be slid rearwardly upon the core until it is engaged by the cross-head 93 in the manner shown in Fig. 13 of the drawings. By inserting a plate of the proper length in this manner the advance of the cross-head may be interrupted at any point in its travel, and thus limit the length of the core inserted, within the tube. A fixed stop 102 abuts the end of the tube 75 to prevent longitudinal displacement of the tube during the insertion of the core. When a short length of tube is to be bent, an arm 102 pivoted at 103 is provided. This arm 102 has a head 104 formed on its outer extremity so that when the arm is swung into the position indicated in dot in Fig. 1, the

end face 104 forms a stop for the tube in the same, manner as the fixed stop 102 in the case of a full length tube. The'length of the arm 102 would naturally be'varied for different lengths of tube. Any other suitable form of adjustable stop might be direction. The h-andlefBO is now depressed 'to'bringthe roller '58 :into its operative position opposite the blade 81.

*Pressure is i now admitted to :the cylinder '24: in rear otthe piston Q'Twhi-ch advances 'thepiston rod 36- carrying the bendingihead 37. The advanceot'the piston rodi361acts upon the toggle links 40:and tl to cause the rollers and 51 to press against the rear guide face of the die, and the roller 58 to be drawn inwardly :and :to tightly press the blade 81 against the zouter'face of the tube. The further advance 'of the piston rodcauses the bending head ito-.move

outwardly along the die 69'. and to 'force the -tubeinto the forminggrooveitherein. Th cylinder 24cSWlI1gS upon it pivoted ,rear

end and is Lfree ito moveiin'=the:pathidetermined-"by the die. Theiblade -81ibends with the tube under the "pressure of the roller 58 andfprevents any scoring of :the outer face of the'tube by this roller during the bending operation. llihe bending 'head is now returned to; its initial .position by areversing the valve 32. The?blade*-81:may now be withdrawn'by disengagingthe lock '90.:and releasing thepressure in the cylinder '86.

v The core may be withdrawn from the tube upon the completion of ':the zbending operation by reversing the valve 35=1t0 admit pressure throughthe pipe 34 andfithus force :the cross-head 1'93 rearwardly to "the "position indicated in Fig. .2. The ibGIlt :tube

may now be removed from the-bending die and:th'e operation repeated on a new "tube. The same core 'may be used in bendingia large number of tubes.

Itwillithus be seen that iwithith'epresent invention a tube may be bent into substantially any curvature by the use of :the

proper die and the tube is fully protec'ted against scoring'during :the bending opera- -*ti0n. The toggle connection:betweenthe actuating piston and thebending head insures complete and accurate bending of the tube.

The core is quicklyandeasily inserted into and'withdrawn fromthe tube and *the same core may be-used indefinitely. The

bending'operation is entirely -mechanical and requires :no skill on the part of the operator. 'The amount of the insertion of the core in the tube'is'readily-adjusted. The

core provides I uniformity :in: cross section of -the bent tube.

"I am aware that :many

changes may be -made invthe formandvarrangement otparts for bending attenuated said guidingrmember, wan actuatingamemher for moving the bending member between sai-dvbending member and said :ac- -t-uat1ng :member, for permitting 1 rocking of "the bending memberrelative to the actuator.

2. In a machine'lofthe class desoribed, a :eurved "forming member, *a correspondingly curved guide, .a f bending 1 head 'co-operating with said guide for 'bending an attenuated member zaroundlsaid forming ;member, and

-tuator :being pivotally connected zto said head to .permit rocking of said: headxrelative ltOSiLldiflCtHdtOI.

In1 a fmachine of ithe classdes cribed, .a'

curved iforming t'member, a correspondingly curved i guide, :a abending head co-operating with said guide for lbending -i an attenuated :member '1 around rsaid 'rforming imember, and

a .zrecip roeatingractuator :p ivotally connected tto ..=said "head for moving said :head along said guidezand said forming member.

4. sInr-a machine ofthecla'ss described, a support, :a cylinder: mounted upon said support and movable :relative 'zthereto, fa piston within said cylinder, a pistonrodconneeted to saidpiston, a former, and means for a'c- 'ztuating said gpiston ito move said head over the i'operative iface Y of :said former, '-iazrbendwing headwcarriediuponisaidrod, :a guide for said head.

'"In;a.machine ofithe class described, a support, a cylinder -pivotally imounted on a said support, a piston within said cylinder, :a piston rod connected :to said piston, a bending ihead mounted :upon said piston :rod,aa guide .for saidhead zaidie including a forming groove and means ifOI' admitting fluid under :pressure to lsaid :cylinder to cause said fhead Yto be moved :longitudin-ally of said grove and to be "forced rtowar'd said die.

"6. ln a machine ofthe class described, a support, a cylinder ;;pivotally mounted at one end llPOIlISZIid'SUPPOFi), guiding means for said cylinder, a "piston within :said cylinder, 1a piston :rod,';and a :bending head supportedby said rod and connected there-- to-by a toggle'joi-nt. i

" 7. In'a bending maehine,-adie provided 180 along the former, and a pivotal connection 1- 21 11 1 actuator foi moving saidiheadr along. said :guide and said :formingamember, ssai'd acactuator for said head pivotally connected thereto, and a flexible metallic strip interposed between said die and said presser member and extending substantially longitudinally of said groove, said presser member passing over theface of said strip during said longitudinal movement.

9. In a bending machine, a die provided with a forming groove, a presser member disposed opposite to the face of said die and movable longitudinally of said groove, a flexible member interposed between said die and said presser member and means for moving said flexible member toward and from said die including a cylinder, a piston in said cylinder, a piston rod, a cross-head on said rod connected to said flexible member, and means for admitting fluid to said cylinder to actuate said piston.

10. In a bending machine, a die provided with a forming groove, a presser member disposed opposite to the face of said die and movable longitudinally of said groove, a flexible member interposed between said die and said presser member and means for -moving said flexible member toward and from said die including a cylinder, a piston in said cylinder, a piston rod, a crosshead on said rod connected to said flexible member, means for admitting fluid to said cylinder to actuate said piston, and means for locking said cross-head in its forward position.

11. In a tube bending machine, the combination with a laminated core of means for inserting a laminated core into a tube to form a filler therefor, and means for bending the filled tube comprising a forming member, a presser member movable relative to said forming member and guided thereby, and means for actuating said presser member.

12. In a tube bending machine,-the combination with a. laminated core of means for inserting said core into the tube to form a filler therefor, and means for bending the filled tube comprising a die provided with a forming groove, a bending member movable over the face of said die longitudinally of said groove andguided by'said die means for actuating said bending member, and means for controlling said actuating means.

13. In a machine of the class described,

the combination with a laminated core of means for inserting the core into a tube comprising a cylinder, a piston within said cylinder, a piston rod, a cross-head on the outer extremity of said rod, core engaging means on said cross-head, and means for admitting fluid under pressure 'to said cylinder to actuate saidpiston.

14. In a machine of the class described,

the combination with a laminated core of means for inserting the core into a tube before bending said tube and withdrawingsaid core from said tube upon the completion of the bending operation comprising a cylinder, a piston within said cylinder, a piston rod connected to saidpiston, a crosshead mounted on said rod, guiding means for said cross-head, means on said crosshead for engaging said core, and means for admitting fluid under pressure to said cylinder to actuate said piston.

15. In a bending machine, a forming die and a bending head movable relative to said die and comprising a saddle, a slide mounted in said saddle, a tube bending member carried by said slide, and a toggle joint con necting said slide and said saddle for moving said slide relative to said saddle.

16. In a bending machine, a forming die and a bending head bodily movable relative to said die and comprising a saddle, a guide, guide engaging means on said saddle, a slide mounted in said saddle and movable therein substantially toward and from said engaging means, a tube bending member carried by said slide, and a toggle joint connecting said saddle and said slide for actuating said slide.

17. In a bending machine, a bending head comprising a saddle, a guide, guide engaging rollers on said saddle, a slide mounted in said saddle and movable therein substantially toward and from said rollers, a tube bending member carried by said slide and movable relative thereto into and out of operative position, and a toggle joint connecting said slide and said saddle for actuating said slide.

18. In a machine of the class described, a laminated core, and means for inserting said core into a tube comprising a plunger, core engaging means on said plunger, means for actuating said plunger, and adjustable means for limiting the forward stroke of said plunger.

19. In a machine of the class described, a curved forming member, a correspondingly curved guide, a bending head cooperating with said guide for bending an attenuated member around said forming member, and a reciprocating actuator pivotally connected to said head for moving said head along said guide and said forming member, said actuator'being capable of a limited oscillation as it reciprocates.

bending head movable longitudinally of said groove and co-acting With opposing faces of said die to press a tube into said groove as said head is advanced, and means including a pressure cylinder for actuating said head.

21. In a bending machine, a die provided with a forming groove, a bending head movable upon the face of said die longitudinally of said groove, and means for actuating said head including a plunger, and a toggle joint connecting said'plunger with said head.

22. In a machine of the class described,

a base, a. curved forming member, a correspondingly curved guide, a bending head cooperating with said guide for bending" an attenuated member around said forming member, and a two-part actuator for moving said head relative to said base, one of the parts of said actuator being pivot'ally l connected to the base and the other pivot ally connected to the head.

23. In a machine of the class described,

a forming member, a bending member, one

of said members being adapted to travel over the operative face of the other member, means for efiecting said travel, and guides along the path of said travelfor directing the same, and, during such travel, maintaining a fixed relation between said bending member and the surface of the former.

24. In a bending machine, presser mechanism including a cylinder, a piston in said cylinder, a piston rod connected to said piston, a presser head mounted on said rod, and

acting at substantially a right angle to the axis thereof, and means for admitting fluid under pressure tosaid cylinder to actuate said piston.

MATTHEW r1 BAYER. 

